Threading tool for automatic machines



July 3, 1923. f

x I 1,460,740 i H. T; WHITE THREADING TOOL FOR AUTOMATIC MACHINES Fi -led Dec. 11, 1920 a Sheets-Sheet 1 INVENTOR. Jicmy 7, W2 ZZZ WMW.

+WAJW.

ATTORNEY S July 3, 1923;

. 1,460,740 H. T. \MHITE THREADING TOOL FOR AUTOMATIC MACHINES Filed D'e. 11. 1920 5 Shegts-Sheet 2 v71 I III INVENTOR. Jinx) 7.7/02 66 BY W /W July 3, 1923.

H. T. WHITE THREADING TOOL FOR AUTOMATIC MACHINES Filed Dec. 11, 1920 3 Sheets$heet 5 INVENTOR- Jim V7," 14 2 z-Ze flr/Lmm A TTORNEYE Patented July 3, 1923.

HARRY '12. WHITE, or HIGHLAND PARK, MICHIGAN.

THnnADIns moon roe AUTOMATIC ACHINES,

Application filed December 11, 1920. Serial No. 429,865.

' Threading Tools for Automatic Machines,

' the Also the rotary head is longitudinally movof which the following is a specification, reference being had therein to the accompanying drawings. v i

The invention relates to threading tools of that type in which the threading is ef fected by a series of chasers surrounding and concentric to the axis of the work which is rotated in relation thereto. t 7

It is usual to mount the chasers in a head which is rotatable upon a shank carrying ca ms for actuating the chaser jaws inward and outward. A latch is provided for holding the head in a position on the shank where the chasers are closed in or in cutting position, and a spring is provided for rotating the head to expand the chaser jaws when threading operation is completed.

able. upon the shank a suflicientdistance to disengage from the latch when the cutting of the thread is completed, this being accomplished by the holding of the shank from movement while the head is still advanced upon the thread of the work. I

The general organization of my improved tool is the same as with other tools of the type, but the present invention relates to certain improved features which add to the convenience and accuracy of the tool and simplify its manufacture. One of these features is the construction of the chasers or thread cutters and the manner of mounting the same. Another feature is the construction which permits of the introduction of the spring or springs for rotating the head after all the other parts have been assembled.

Other features will'be" morefspecifically referred to hereinafter.

In the drawings: I Figure 1 is a sectional side elevation of the. tool;

Figure 2 omitted; p

Figure 3. is a cross-section on line of Figure 1 Figure 4 is a longitudinal section on line 44: of Figure 3;

Figure 5 is a cross-section on line 5- 5 of Figure 6; and

is an end elevation with parts struction'. i

I Figure 11 is a detail sectional view taken" 'on the line 11-11 of Figure 2/ o a i I A is the shank ofthe tool which is adapted I for mounting in the machine "in alignment with the work to be threaded. B is a collar projecting radially outward from the'shan'lr,

Figure 6 is a longitudinal section on line 6-6 of Figure 5;;

Figure 7 of Figure 8; and

Figure 8 is a. cross-section on line of Figure 7 Figures 9 and 10-are views similz'n? to showing a. modified con- Figures 1 v and 2 4 is a'longitudinalfsection on line I and C is a head which is sleeved upon the f shank and has a. limited longitudinal adjust ment thereon. This head is formed ofseveral annular members D, E and F, which are machined and fitted to each other. The

member D fits about'a. portion of the shank A and is recessed on-its rear side to receive the collar B. The member E also fits about} ber D, and its forward portion is radially a portion of the shank in front of the memslotted to receive the Chasers orthread cutters.- The members D and E are rotatively fixed to each other and tothe collar B by" pins G which arepreferably tightly fitted to the member 1) and slida-blyfitted in the collar B and member E. Shoulder screws H also connect the members D and E',-tlie heads H of which engage counterbores in the v memberE, while sp'ringsl sleevedup'on the shanks of said screws albut with their o-ppo site ends against. the heads H and the beta tom of the counterbore. The arrangement is such that the members D and Eare yieldably held in contact by the tension of the separation while maintaining their rotatively fixed relatlon.

ber D, but is held from longitudinal movement by a shouldered portion F", which re- 9'5; springs I, but are capable of longitudinal 1 tains it from movement in one direction, while a plate J holds, it from movement in the opposite direction. .The'fmemher Efiis provided with an outwardlyextending" flange E and between this flange and-the member F is formed an, annular groove which is engaged by an annular member K,

in which areiormed the cams L for moving the chasers into the; work. I I

The Chasers M are mounted as bef'ore described in radial slots in the membenE surfaces are hardened and a from each other.

and are controlled in position by engagement with the cams. To simplify the construction of. these chasers, the thread cut ting portion thereof is formed on a rectangular'blockM whichis secured by a clamping'screw, N to an L-shaped block 0. The

inner portionO of this block isof greater Width than the blocks M and engages a T-shaped groove in the member E to retain the ohasers from any movement other than radial one. The outwardly extending portion of the blocks 0 are slightly rounded on their outer faces and engage the cams L, which latter are formed byniilling into the member K. All of the contacting ground and therefore the wear caused by rubbing con tact is comparatively slight] The chaser-s are yieldably moved outward against the cam by springs P located in recesses in the member E. and engaging laterally extending pins Q on the blocks 0.

The inward movement of the chasers into.

working position is effected by rotation of the member K inrespect to the shank A and members D, E and F. To secure sccuracy in the performance of the work, the

inner limit of movement of the chasers must be exactly predetermined and this requires the stopping'of the rotation of the member K at an exactly predetermined point. This stopping is effected primarily by a latch pin R slidably engaging a recess in; the member F and also engage-able with a re cess in the member K, into whien it is projeeted by the tension ofa spring B. This will lock the member K from rotation until the pin is disengaged from its locking recess,.which is accomplished by the longitu-' dinal separation of the members F and K V The -memb-cr I? is rotatively adjustable in relation to the member D by means of a pair of opposed set-screws S and S in the member If engaging a pin 3 projecting radially from the member l). This pin enters a grooves in the inner face of the memberl and extending longitudinally thereof, the width of said groove being sufficient to provide for the necessary range of adjustment and the set-screws S and S lockin the pin in difterentpositions' ,U are engaged.

located by pins WV securing the same'to member K. r To avoid breakingof the thread cutters lost motion in the par s and as the latch pinR is subject to wear, it'is obvious that there is danger of loss of accuracy. This I have avoided by making both the pin R and the keeper therefor of renewable parts,

so that whenever any lost motion develops these parts may be replaced to again secure accuracy. In the specific construction shown the keeper R is formed in a segmental block, which is secured in a recess in the member K by a series of screws R and a locking pin R This block [may be exchanged at any time by removing the screws," and the latch 'pinlt maybe detached by removing the plate J and slipping it out from the recess. i

The chasers are retracted after the completion of the worlr, first by the longitu; dinal pull upon the headE' which carries with it the member K and separates the latter from the member F sons to release the latch pin B. When thus released, the member it must be revolved to release the pressureofthe cams Land. thisrotation is effected bv a spring or springs T. With constructions as heretofore made it is usn-" ally necessary to assemble the springs wlth the other parts and on accountof the relatively high tension, this operationis difficult. With my improved construction all cfthe other parts are first assembled after which the spring or springs may be inserted and placed under the requisite tension. Speeifieal y, the member K has formed therein the annular recess T forming a,

groove for receiving the spring, and an abutment block is placed in this recess in one endof the spring; the other end of which engages an abutment on the mem- .ber E. Preferably two springs are employed and each of these is inserted into the recess T through a tangential entrance port U. The'ports U are closed by screwthreaded plugs U which also constitutethe abutments for the springs. The opposite ends of the springs engagewith pins V, which engage radial apertures in the member E and project outward therefrom into the annular recess T. The rotary movement.

under the tension of the springs is limited by stop blocks VJ, which are placed inthe annular recess Tfand these blocks are so" arranged as to form complementaryparts of the threaded. recesses in which the plugs .i

The stop blocks W are or chasers, due to the impact of the wort; thereagainst, a yielding cushion is provided. This is formed by springs X placed in bosses in the member D, which bear against the flange B and normally separate saie flange and member D. When. however,

there is an impact against thehead 13, the

springs X will yield and will cushion the blow." With the construction as described, it will be understood that the manufacture of the parts comprising the tool issimple and inexpensive, while the assembly of the parts may be quickly accomplished. The order ofassembly is to first engage the chaser-s with the radial slots in the head E, then to place the sleeve K in engagement withsaid head, and to secure these parts together by, an annular front plate Y secured by screws Y. The pins G being pressed into engagement with the member D and the member F being also engaged with said member D, theseparts may then be assembled with the parts E and Kand are secured by the bolts H with the springs I sleeved thereon. The springs X are then placed in the recesses in the member D,

after which the shank A may be assembled I with the other members and secured by the engagement of the plate J. Finally the springs T are inserted through the tan gential ports U to bear against the pins V and the plugs U are inserted and screwed in to form abutments for said springs.

In operation, the revolving work is led axially into engagement'with the chasers, the shock of first contact being cushioned by the springs X. The threading operation will then continue until'completed, where upon arrest of further inward movement of the work will cause a pull upon the chasers and head E, separating the member K from the member F and disengaging the latch pin R- from the keeper block R This will permit "the springs T to quickly revolve the sleeve K, thereby withdrawing the cams from the blocks 0 and permitting the springs P to retract the'chasers out o1": engagement with the work. The chasers are then restored to operative position by'ro tating the member K until the latch pin R again engages with its keeper.

In Figures 9 and 10 a modified construction is shown which is designed for a threading operation where the tool is revolved and thework is stationary. With this construction the chaser blocks M are engaged with L-shaped holder blocks l 2 which have cam portions 0 thereon for engagement with a longitudinally adjustable sleeve member K. This sleeve member is mounted upon the head E which has the radial slots for receiving the chasers and which is also attached to the revoluble spindle A. The members E and K are secured to each other against relative rotation by bolts or pins I-I having springs I sleeved thereon and said bolts also secure to the member K a grooved collar Z; This collar forms a means for adjusting the members Z and K longitudinally in relation to the members A' and E while permitting the rotation of all of said members andsuch adjust ment will effect the radial movement. at the with the sleeve member'K. There is also a'means of adjustment provided by which chasers by the'engagementbf the cams "Of the enact size ofth'e finished work may be determined, this consist ng ail-cams L on ment effected by a construction similar toth'e parts S, S and S already described and indicated at S*. Witlrthis modified construction the operation is substantially thesam'e, with thejexception that tlie'work is stationary and the tool is -revolved, while the relative longitudinal movement is effected by a suitable fork -(not shown) engaging the grooved collar Z-. i

What Iclaim as myinvention is: 1 I

1. Ina thread-cutting tool, the combina- 7 tion with a head,rad-ially adjustable Chasers carried bylsaid; head and a'cam member for actuating said chasers rotatable upon said head and provided with an annular recess, of a spring located within said recess between said head and' cam for efi'ecting the relative rotation thereof, and means-for inserting said'spring within said recess and subsequent to the assembly of the other parts.

2. In a thread-cutting"tool, the combina- Y tion with a head' a nd ohasers radially ad- I justable in relation thereto, of a cam for ad usting said chasers rotatable 'upon said head, said cam and head being constructed to form an annular recess therebetween with an abutment secured to the one projecting into said recess, a spring insertable through a I no, 3. In a thread-cutting tool, thecombinanular recesstherebetween with a tangential entrance port to said recess, a spring-insertable into said recess through said tangential port, and a plug for 'closing said port and'forming an abutment for said spring.

4. In a tool, the combination with a head and a memberradially adjustable ,in 'relation thereto, of a member rotatable upon said head, said head and member being formed to provide anannular recess therebetween with a -tangential entrance portto said recess, afspringinsertable into said recess through said tangentialentrance port,

105 a tangential entrance port into saidrecess Y &

an abutment for said'springsecured to one of said members and projecting into said recess, a stop forsaid abutment-within said recess adjacent to' said tangential entrance port and forming a complementary portion of the wall thereof, and a screw-threaded plug forminga closure for said tangential port engaging corresponding threads in said port and stop.

5. Ina tool, the'combination with ahead and a cuttermember radially adjustable in relation thereto, of a member rotatable on said head, said member and head having formed therebetween, an annular recess with a pair of tangential entrance ports on metrically opposite sides thereof, springs 1n- .sertable through said entrance ports into said recess, abutments on one or" said members projecting into said recess on diametrically opposite sides thereof and engaging therespective springs, stop blocks for said abutments secured to the other of said members adjacent to said tangential'ports and forming complementary portions of the walls thereoiand screw-threaded plugs for closing said ports engaging corresponding threads in the walls thereof and in said stop block's. Y f I 6. In a tool, the combination with a head and a plurality of radially adjustable chaser blocks carried thereby, of a rotary member mounted on said head and having an annular recess in itsinner thee with a tangential entrance port from the outer face thereof, an abutment pin projecting radially from said head into said recess, a spring in I c sortable in said recess through said entrance port, and a screw-threadedplug for closing.

8. In a thread-cutting tool, thecombination with a head having a chaser guideway therein, of a chaser comprising a rectangular block oonstitutlnga cutter, an L-shaped carrier for said block having a relatively wide longitudinal portion, for engaging said guideway and n angular portion for engaging theendof saidblock, and a screw for securing saidv block and carrier in fixed relation.

- 9. In a thread-cutting tool, the combina tion with a head having a chaser guide-way therein of T-sha'ped form, a chaser for engaging said guide-way comprising aj sub stantially rectangular cutter bloclrhtting nto the stem po ion of said T-shaped guideit way, an L-sliaped carrier for said block hai r portion of said i shaped guide-way,'and an outer portion for engaging the end of said block, said inner-portion having a greater width than said outerpcrtion, and a screw passing through said ,block and into enient with said carrier to holdthe same in. hiie'd relation. I j Y l0. lfn a thread-cutting tool,'the combination with a head having a radial guide.- way therein oi": ll-shaped cross section, a chaser for engaging said guide-Waycomprising rectangular cutter block for engaging the stem portion of said T-shapedguides way, and an Iii-shaped carrier with which said block is detachabl en 'as'ed slidabl i c t ta 7 engaging the base of said carrier having a greater width than .said cutter block, the head portion on saicl isliaped guideway.

11. A thread-cutting tool comprising a shank, a head sleeved upon said shank and provi ed with radially extending guideways, chasers slidably secured in said guideways, a rotatable member surrounding said head and provided. with cams for actuating-said chasers in said guideways, a non-rotatable l g an inner portion fitting into the head sci. l sleeved on said shanlradjacent to said -mentioned head, a latch for locking said table heac, resilient means for holding said heads in contact with'eachother, permitting the longitudinal adjustment; of said ble head to disengage the latch there? from, and means for cushioning the non-- rotatable head upon said shank permitting a limited longitudinal movement thereof.

A thread-cutting tool comprising a shank, collar thereon, a head sleeved upon said shank and recessed to receive said col lar, a pin extending parallel to said shank,

forming a rotativefcoupling between said head and collar, ahead adj acentto said first table head in fixed relation to said nonmentioned head slidably engaging said pin,

a resilient. yieldable connection for holding said heads in contact with .eachother, chasers slidab y radial guides in said lastnientioned head, a rotatable member engaging said heads and having cams for actuating said chasers, an annular member surrounding said first-mentioned head adjacent to said rotatable member, .a latch for look ing said rotatable member and annular memher to eachother, and means for rotatively adjusting said annular member inrelation to said first-mentioned head to exactly predetermine the adjustment of said chasers in working position.

block for said abutment chasers radially, an annular member sur rounding said head beneath vsaid rotatable member, a spring .pressed catch slidably mounted n1 said annular member forengagejustable in relation thereto, of a member rd tatable upon said head for actuating said chasers radially, said head and rotatable member being constructed to form an annu lar recess therebetween with a tangential entrance port to said recess, a spring insertable into said recess through said tangential entrance port, an abutment on one of said members projecting into said recess, a stop secured to the other of said members, an annular member surrounding said head, a catch carried by said annular member for engagement with said rotatable member, and means for adjusting said annular member about said head.

15. In a thread-cuttingtool, the combination With a head and chasers radially adjustable in relation thereto, of a: member roy tatable about said head for actuating said chasers radially, an annular member surroundlng sald head beneath said rotatable member, an. automatically operated catch slidably mounted in said annular 'member for engagement'with said rotatable member,

and means for adjusting said rotatable member with respect to said head when said catch is disengaged therewith. v

16. In a threadcutting tool, the combination with a head and chasers radially adjustable in relation thereto, of a member rotatable about said head for actuating said chasers, said head and rotatable member be-- ing constructed to form an annular recess therebetw' een with a tangential entrance port to said recess, a spring insertable into said recess through said tangential entrance port,

an abutment on one of said members pro-v gectlng into said recess, and a'stop block for said abutment secured to the other of said members.

In testimonywhereof I affix-my signature. 55

HARRY TQW ITE. 

